Acoustic generator, acoustic generation device, and electronic device

摘要

The problem is to reduce variations of sound pressure in the sound pressure frequency characteristics. To solve the problem, an acoustic generator includes a film that is a supporting plate; a frame member that is provided on the outer circumference of the film; a piezoelectric element that is provided on the film within a frame of the frame member; and a resin layer that is provided on the film within the frame of the frame member, and the resin layer including an air bubble. By the air bubble, a decrease in the sound pressure is prevented, peaks and dips in the frequency characteristics of sound pressure are reduced, and high-quality sounds are generated.

主权项

1. An acoustic generator comprising:
a film; a frame that is provided on a periphery of the film; a piezoelectric element that is distinct from and adjacent to the film and is provided inside the frame; and a resin layer that is provided on the film and is provided inside the frame, the resin layer including a plurality of air bubbles, wherein the plurality of air bubbles comprises a plurality of first air bubbles which is abutting an area where stiffness changes, the plurality of first air bubbles includes at least one of second and third air bubbles, the second air bubbles are provided to abut a boundary between the piezoelectric element and the resin layer, each of the second air bubbles has a shape that elongates in a direction along the boundary between the piezoelectric element and the resin layer, and the third air bubbles are provided to abut a boundary between the frame and the resin layer, each of the third air bubbles has a shape that elongates in a direction along the boundary between the frame and the resin layer.